Strain is an important parameter reflecting structural state, which is particularly important in the field of structural health monitoring (SHM). It can be used to evaluate the mechanical properties, failure behavior, crack development and residual stress of structural members and materials. It is particularly important in the field of structural health monitoring (SHM). In this paper, a new type of large gauge strain sensor is proposed. The proposed sensor is based on micro vision and uses a camera to capture small displacement. The packaging structure of strain sensor with sensing gauge length of about 50 cm is designed. In order to realize the monitoring in the field environment, the microscopic images in the experiment are obtained by webcam, which has broad application prospects. In the field of view of the camera, the maximum distance that the probe in the sensor can move is certain, but when the sensing gauge distance increases, the accuracy of strain measurement will be improved. The strain data obtained by the sensor is compared with the data obtained by FBG sensors to verify the measurement accuracy. It is found that the measurement accuracy is suitable for SHM of infrastructure.
In recent years, the nonnegligible corrosion of steel strand for overhead ground wires has also been detected during operation. It is of great significance to efficiently monitor the corrosion of the steel strand in real-time. In this paper, a new kind of tensile corrosion sensor based on fiber Bragg grating sensing technique was proposed and developed, which can accurately monitor the corrosion of the steel strand in real-time. The performance of the corrosion sensor was studied by an electrochemical corrosion accelerated experiment. The experimental results show that the corrosion sensor can monitor slight and moderate corrosion of the steel strand accurately and effectively, therefore the corrosion sensor is practicable and has broad application prospects in transmission line engineering.
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